.yf-ul {
    display: inline-block;
    list-style: none;
    color: #fff;
    font-size: 20px;
    border: 3px solid #000;
    padding: 20px;
    margin: 0 20px;
    text-align: left;
    background: #333;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
    border-radius: 8px;
}

.yf-li {
    padding: 10px 0;
}

.yf-li::before {
    /* content: "🗹 "; */
    content: attr(sign);
    color: aqua;
}